US2023359001A1PendingUtilityA1

Optical image capturing lenses

83
Assignee: LARGAN PRECISION CO LTDPriority: Aug 24, 2011Filed: Jul 21, 2023Published: Nov 9, 2023
Est. expiryAug 24, 2031(~5.1 yrs left)· nominal 20-yr term from priority
Inventors:Hsin-Hsuan Huang
G02B 13/0045G02B 9/62G02B 1/041
83
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Claims

Abstract

An optical image capturing lenses includes, in order from an object side to an image side, a front lens group, a stop, and a rear lens group. The front lens group includes, in order from the object side to the image side, at least a first lens element and a second lens element. The first lens element has a convex object-side surface and a concave image-side surface. The rear lens group includes, in order from the object side to the image side, at least a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The sixth lens element is made of plastic material. The object-side surface and the image-side surface of the sixth lens are aspheric. The sixth lens element has at least one inflection point formed on at least one of the object-side surface and the image-side surface thereof.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . An optical image capturing lenses comprising seven lens elements, the seven lens elements being, in order from an object side to an image side:
 a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element;   wherein each of the seven lens elements comprises an object-side surface facing towards the object side and an image-side surface facing towards the image side;   wherein the first lens element has negative refractive power, the image-side surface of the first lens element is concave in a paraxial region thereof; the fifth lens element has positive refractive power, the object-side surface of the fifth lens element is convex in a paraxial region thereof, the image-side surface of the fifth lens element is convex in a paraxial region thereof; the sixth lens element has negative refractive power; the image-side surface of the seventh lens element is concave in a paraxial region thereof and comprises at least one convex shape in an off-axis region thereof.   
     
     
         2 . The optical image capturing lenses of  claim 1 , wherein the image-side surface of the third lens element is convex in a paraxial region thereof. 
     
     
         3 . The optical image capturing lenses of  claim 1 , wherein the object-side surface of the fourth lens element is concave in a paraxial region thereof. 
     
     
         4 . The optical image capturing lenses of  claim 1 , wherein the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof. 
     
     
         5 . The optical image capturing lenses of  claim 1 , wherein the third lens element has positive refractive power, the object-side surface of the third lens element is concave in a paraxial region thereof, the image-side surface of the third lens element is convex in a paraxial region thereof. 
     
     
         6 . The optical image capturing lenses of  claim 1 , wherein the second lens element has negative refractive power. 
     
     
         7 . The optical image capturing lenses of  claim 1 , wherein the object-side surface of the third lens element is concave in a paraxial region thereof; at least three of the lens elements are made of plastic. 
     
     
         8 . The optical image capturing lenses of  claim 1 , wherein the object-side surface of the first lens element is convex in a paraxial region thereof; the object-side surface of the seventh lens element is convex in a paraxial region thereof; at least three of the lens elements have both of the object-side surface and the image-side surface being aspheric. 
     
     
         9 . The optical image capturing lenses of  claim 1 , further comprising:
 an aperture stop disposed between the third lens element and the fourth lens element.   
     
     
         10 . The optical image capturing lenses of  claim 1 , wherein a central thickness of the first lens element is CT 1 , a central thickness of the second lens element is CT 2 , and the following relationship is satisfied:
   2.0<CT1/CT2<3.5.   
     
     
         11 . The optical image capturing lenses of  claim 1 , wherein a central thickness of the first lens element is CT 1 , a central thickness of the second lens element is CT 2 , and the following relationship is satisfied:
   2.0<CT1/CT2≤2.95.
   
     
     
         12 . The optical image capturing lenses of  claim 1 , wherein a focal length of a front lens group is ff, a focal length of a rear lens group is fr, and the following relationship is satisfied:
   −1.0 <fr/ff< 0.1.
   
     
     
         13 . The optical image capturing lenses of  claim 1 , wherein a maximal chief ray angle on an image plane of the optical image capturing lenses is CRAmax, and the following relationship is satisfied:
   CRAmax<15 degrees.   
     
     
         14 . The optical image capturing lenses of  claim 1 , wherein an axial distance between the third lens element and the fourth lens element is smaller than a central thickness of the third lens element. 
     
     
         15 . The optical image capturing lenses of  claim 1 , wherein an axial distance between the sixth lens element and the seventh lens element is greater than a central thickness of the sixth lens element. 
     
     
         16 . The optical image capturing lenses of  claim 1 , wherein an axial distance between the sixth lens element and the seventh lens element is greater than an axial distance between the fifth lens element and the sixth lens element. 
     
     
         17 . The optical image capturing lenses of  claim 1 , wherein a curvature radius of the object-side surface of the sixth lens element and a curvature radius of the image-side surface of the sixth lens element have the same sign. 
     
     
         18 . The optical image capturing lenses of  claim 1 , wherein a central thickness of the fourth lens element is greater than an axial distance between the third lens element and the fourth lens element. 
     
     
         19 . The optical image capturing lenses of  claim 1 , wherein a central thickness of the fourth lens element is greater than a central thickness of the second lens element. 
     
     
         20 . The optical image capturing lenses of  claim 1 , wherein an axial distance between the first lens element and the second lens element is greater than an axial distance between the second lens element and the third lens element.

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